Stop message.el from loading about 40 libraries it doesn't always need.

The general approach is to autoload rather than require, and to
require in the specific functions rather than the file.  (Bug#5642)

* url/url.el: Move mailcap require earlier in the file.

* gnus/gmm-utils.el: Don't require wid-edit.
(widget-create-child-value, widget-convert, widget-default-get):
Autoload.

* gnus/gnus-util.el: Don't require time-date, netrc.
(message-fetch-field, gnus-group-name-decode): Declare rather than
autoloading.
(gnus-fetch-field): Require message.
(gnus-decode-newsgroups): Require gnus-group.

* gnus/ietf-drums.el: Don't require time-date.

* gnus/message.el: Don't require hashcash, canlock, ecomplete.
Do require mail-utils.  Require nnheader only when compiling.
(smtpmail-default-smtp-server): Remove declaration.
(message-send-mail-function): Check smtpmail-default-smtp-server
is bound rather than requiring smtpmail.
(message-auto-save-directory, message-insert-signature): Use
expand-file-name rather than nnheader-concat.
(nnheader-insert-file-contents): Autoload.
(hashcash-wait-async): Declare.
(message-send-mail): Only call gnus-setup-posting-charset if
gnus-group-posting-charset-alist is bound.  Require hashcash if needed.
(message-send-mail-with-sendmail): Require sendmail.
(canlock-password, canlock-password-for-verify): Declare.
(message-canlock-password): Require canlock.
(nnheader-get-report): Autoload.
(gnus-setup-posting-charset): Declare.
(message-send-news): Require gnus-msg.
(message-make-references, message-make-in-reply-to): Use mail-header-id
rather than the alias mail-header-message-id.
(ecomplete-add-item, ecomplete-save): Declare.
(message-put-addresses-in-ecomplete): Require ecomplete.
(ecomplete-display-matches): Autoload.

* gnus/mm-decode.el: Don't require mailcap, gnus-util.
(gnus-map-function, gnus-replace-in-string, gnus-read-shell-command)
(message-fetch-field, mailcap-parse-mailcaps, mailcap-mime-info):
Autoload.
(mailcap-mime-extensions): Declare.

* gnus/mm-encode.el: Don't require mailcap.
(mailcap-extension-to-mime): Autoload.

* gnus/mml-sec.el: Don't require password-cache.

* gnus/mml.el (gnus-setup-posting-charset): Declare rather than autoload.
(mailcap-parse-mimetypes, mailcap-mime-types): Declare.
(mml-minibuffer-read-type): Require mailcap.
(mml-preview): Require gnus-msg.

* gnus/mml1991.el: Require password-cache.
(password-cache-expiry): Remove declaration.

* gnus/mml2015.el: Require password-cache.
(password-cache-expiry): Remove declaration.

* gnus/nneething.el (mailcap): Require mailcap.

* gnus/nnheader.el: (declare-function): Add compatibility stub.
(message-remove-header): Declare rather than autoload.
(nnheader-replace-header): Require message.

* gnus/nnimap.el (declare-function): Add compatibility stub.
(netrc-parse, netrc-machine-user-or-password): Declare.
(nnimap-open-connection): Require netrc.

* gnus/nntp.el (declare-function): Add compatibility stub.
(netrc-parse, netrc-machine, netrc-get): Declare.
(nntp-send-authinfo): Require netrc.

* gnus/rfc2047.el: Don't require qp.
(quoted-printable-encode-region, quoted-printable-decode-string):
Autoload.

* gnus/sieve-mode.el: Don't require easymenu.
(easy-menu-add-item): Autoload it.

* gnus/spam-stat.el (time-to-number-of-days): Autoload it.

* password-cache.el (password-cache, password-cache-expiry):
Autoload.

1 files changed, 10 insertions, 2 deletions

diff --git a/lisp/gnus/mm-decode.el b/lisp/gnus/mm-decode.el
index a511253dddb..8bc659f5184 100644
--- a/lisp/gnus/mm-decode.el
+++ b/lisp/gnus/mm-decode.el
@@ -29,12 +29,14 @@
   (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
 
 (require 'mail-parse)
-(require 'mailcap)
 (require 'mm-bodies)
-(require 'gnus-util)
 (eval-when-compile (require 'cl)
 		   (require 'term))
 
+(autoload 'gnus-map-function "gnus-util")
+(autoload 'gnus-replace-in-string "gnus-util")
+(autoload 'gnus-read-shell-command "gnus-util")
+
 (autoload 'mm-inline-partial "mm-partial")
 (autoload 'mm-inline-external-body "mm-extern")
 (autoload 'mm-extern-cache-contents "mm-extern")
@@ -550,6 +552,8 @@ Postpone undisplaying of viewers for types in
     (message "Destroying external MIME viewers")
     (mm-destroy-parts mm-postponed-undisplay-list)))
 
+(autoload 'message-fetch-field "message")
+
 (defun mm-dissect-buffer (&optional no-strict-mime loose-mime from)
   "Dissect the current buffer and return a list of MIME handles."
   (save-excursion
@@ -688,6 +692,9 @@ Postpone undisplaying of viewers for types in
 	  (goto-char (point-max)))
       (mapcar 'mm-display-parts handle))))
 
+(autoload 'mailcap-parse-mailcaps "mailcap")
+(autoload 'mailcap-mime-info "mailcap")
+
 (defun mm-display-part (handle &optional no-default)
   "Display the MIME part represented by HANDLE.
 Returns nil if the part is removed; inline if displayed inline;
@@ -747,6 +754,7 @@ external if displayed external."
 		 handle 'mailcap-save-binary-file)))))))))
 
 (declare-function gnus-configure-windows "gnus-win" (setting &optional force))
+(defvar mailcap-mime-extensions)	; mailcap-mime-info autoloads
 
 (defun mm-display-external (handle method)
   "Display HANDLE using METHOD."